Improvement in pure-proof roofing composition



stone-dust, hydrated plaster-of-paris, coal-tar,

- they are thoroughly incorporated or mixed little by little, stirring it into the mixture:

OF LAKE, WISCONSIN.

imenovssnr m Flee-Paco? senses eoaiseelrioa.

Specification forming part of Letters Patent No. October To all whom it may concern: Be it known that I, E. W. HIC'KMAN, of

. the town of Lake, in the county of Milwaukee and State of Wisconsin, have invented certam new and useful Improvements in Fire- Proof Composition for Roofing and I do hereby declare that the following is a full, clear, and exact description thereof, which will enable others skilled in the art to which it appertains to make and use the same.

tThe object of my invention is to furnish a fine-proof composition for roofing buildings of uli descriptions, which is easily applied, durable, economical, and well adapted to the use for which it is intended.

In the preparation of my compifisition for roofing. Luselnarh m fiai ielfie mud, which is a mixture of water and marbleor stone dust, it being the wasto'mud produced in the act of sawing blocks of stone or marble into slats, &c. The same may be produced by grinding and mixing together marble, or stone, or sand with water.

The other ingredients used in my composition are the following: Land-plaster or grindpine-tar, and plastering-hair.

he proportions which I have found to be best for general use approximate the following formulafMarbIe or stone mud, one peck; ground sand, one peck; land-plaster or grind stone dust, one peck; hydrated plasterofparis, one-tenth peck; coal-tar, three gallons;

The process of preparation is as; follows:

Into any vessel large enough to contain them put all the ingredients; and stir them. until together. It is better to add the hair last,

mat nee lasterers;

fifiJW-fi, dated July 23, 1578; application filed 15,1877.

covering the boards with the ordinary paper, felting, or canvas used for such purposes. If the roof is to he used to Walk upon, it shouldreeeive a coating oisand over the composition.

The nature and ofice of the materials used in my composition for roofing may be described as follows: The marble or stone mud gives body or bulk, and ,also solidifies and toughens the mass. Land plaster or grindstonednst furnishes body. Hydrated plasterof-paris absorbs water from the mad, then heats and expels the moisture. Coal-tar is the medium for attaching the other ingredients together and to the roof. QPine tar pro ,vents the mass thorn becoming too hard and r -ir strengthens, 4 and also prevents the eompositihii froiifrniihing down after laying it upon the roof.

In making my composition for roofing, i do not confine myself to the exact proportions above stated, but vary them as my judgment dictates, by usingmore or less of the dry ma terials in proportion to the tar, as the chmate, ion of the hoof, or use to which the building is to be put may indicate that the composition should he stiffer or softer than for general. use.

Having thus described the nature, pro tion, and use of my invention, what I as new, and desire to secure by Let-two cut, is-- 1. A roofing composition eonia-iningin mud, sand, giiaster-of-paris, tanned hair, t-liiii stantieliy as set forth.

2. A roofing composition consisting man hie-mud. send, hydrated piaster-ofiparis, tar, pine-tar, and plastering-hair, suhsian tialiy in the proportions stated.

In testimony that I claim the ibreg'oing as evenly.

The above quantity is suflicient to cover an area of one hundred square feetof roof, over my own i afiis: my signature in prose ice oi." two witnesses.

' EDWIN WV. HICJEMMTL, Witnesses:

which it shouldebe evenly spread, the roof having been first prepared for the same by K. SHAWVAN, (3. Barns. 

